CN105262111A - Series capacitor compensation device on overhead transmission line - Google Patents
Series capacitor compensation device on overhead transmission line Download PDFInfo
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- CN105262111A CN105262111A CN201510755054.3A CN201510755054A CN105262111A CN 105262111 A CN105262111 A CN 105262111A CN 201510755054 A CN201510755054 A CN 201510755054A CN 105262111 A CN105262111 A CN 105262111A
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- transmission line
- wire
- capacitor compensation
- capacitor
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
Abstract
The invention relates to a series capacitor compensation device on an overhead transmission line. The invention aims to provide a series capacitor compensation device on an overhead transmission line so that the series capacitor compensation device is simple and convenient in implement, is less in funding and is excellent in the compensation effect. The technical scheme of the series capacitor compensation device on an overhead transmission line is that: the series capacitor compensation device is arranged on the overhead AC high voltage transmission line; each phase of A, B and C three-phase AC high voltage power lines is provided with a plurality of wires; a capacitor compensation unit is connected with each phase of transmission line in series at set intervals along the power transmission line; and each capacitor compensation unit includes 1-3 wires in each phase of transmission line, wherein the 1-3 wires maintains the original shape, and are used as clamping wires of equipotential voltage, a capacitor bank is connected with the residual wires in series, and the front and tail ends of each capacitor compensation unit are electrically connected through a connection wire. The series capacitor compensation device on an overhead transmission line is suitable for performing distributed series capacitor compensation on the divided wire of the overhead transmission line.
Description
Technical field
The present invention relates to power engineering field, specifically a kind of compensator with series capaci tance be arranged on overhead transmission line.Be applicable to implement distributed serial capacitance compensation on the bundle conductor of overhead transmission line.
Background technology
Series compensation refers to series capacitor compensation and thyristor controlled series capacitor, series capacitor in the transmission line of alternation current of electrical network, utilize the capacitive reactances of series capacitor to compensate the part emotional resistance of power transmission line, electrical distance between generating set can be made to shorten, and synchronising torque increases; Improve the stability of a system, the voltage drop that minimizing power delivery causes and merit angular difference; Improve power system stability operation level, expand circuit transmission capacity, improve the actual conveying capacity of network.
Series compensation capacitor is used to be the important means realizing the long distance of power circuit, Large Copacity, high-efficiency transfer, from nineteen fifty 220KV series compensation capacitor since Sweden successfully puts into operation, along with the progress of capacitor manufacturing technology and control technique in power system, series compensation capacitor obtains and applies more and more widely in high pressure and above transmission line.
Common high-tension electricity overhead transmission line, be from sending end to receiving end with wire, cross over up to a hundred kilometers of straight line conveyings, middle do not have other can realize the facility of electric power compensation in the line except fixing gold utensil, because the reactance value of the average every solid conductor every kilometer of transmission line is about 0.38 ~ 0.4 Ω, if usually with 500KV transmission distance for 250KM, then reactance value is up to 100 Ω, if the electric current in regular link is 300A, then its reactive power is up to Q=I
2x
l=300
2× 100=9000KVAR (kilovolt-ampere), this value is very large, means the reactive loss about having 3 × 1800=about 54,000,000 yuan for a year.
For the problems referred to above, people also contemplate installs compensator with series capaci tance additional in the transmission line of routine, but existing string benefit mode installs concentratedly in electric substation, capacitance is very concentrated, easily cause the low-frequency oscillation SSR accident of overvoltage and system, affect power grid security, generator accident can be caused.Meanwhile, compensation effect is also very limited, and compensativity is only 35%--40%.
Summary of the invention
The technical problem to be solved in the present invention is: provide a kind of compensator with series capaci tance be arranged on overhead transmission line, is easy to implement, fund input is few, object that compensation effect is excellent to reaching.
The technical solution adopted in the present invention is: be arranged on the compensator with series capaci tance on overhead transmission line, this device is installed on built on stilts AC high-voltage electric transmission line, A, B, each phase of C three-phase alternating current high voltage transmission line all has some wires, it is characterized in that: along power transmission sequence every setpoint distance, connect in each phase power transmission line into a capacitor compensation unit, this capacitor compensation unit 1 ~ 3 wire comprised in this phase power transmission line retains the clamp wire of original state as equipotential voltage, and connect into Capacitor banks in every root wire of remainder, the first and last end of each capacitor compensation unit is by connecting wire electrical connection.
Described capacitor compensation cellular installation is between two suspension clamps of reequiping through insulating of setting, and separated by conductor spacer between each wire, insulation cover pad isolated insulation is all used in the contact position of wire and suspension clamp and conductor spacer.
Described setpoint distance is 1 ~ 5 kilometer or 10 ~ 50 kilometers.
Described capacitor compensation unit have quadripartion wherein one be clamp wire, six divisions wherein two for clamp wire or eight divisions wherein three for clamp wire.
The two ends of described capacitor compensation unit install the lightning arrester of overvoltage protection in parallel additional.
Described insulation cover pad adopts silastic material or fluorosioloxane rubber material.
The invention has the beneficial effects as follows: the present invention takes full advantage of the effect of multiconductor bundles in overhead transmission line, using in multiconductor bundles piece separately as equipotential voltage clamp wire, simultaneously, among all fronts Capacitor banks being arranged in piecemeal equably circuit, the operating voltage Ue value of such selection capacitor just does not need to calculate with the line voltage in full of circuit, and be aided with and absorb by the oscillation energy produced when reactance and capacitor generation resonance with clamp wire, the magnitude of voltage after wire clamp only has 1/tens of rated line voltage.So not only greatly reduce the cost of series capacitor, and make circuit achieve high compensativity (can close to 95%), greatly reduce the reactive power loss of circuit, reach the transmission of electricity usefulness of near ideal.Meanwhile, due to the effect of clamp wire, make the timely dissipation energy of capacitor, the low-frequency oscillation of electric power system SSR problem that the resonance of circuit and generator end can be avoided to cause.
Accompanying drawing explanation
Fig. 1 installs structural representation of the present invention along power transmission line.
Fig. 2 is the scheme of installation of single capacitor compensation unit.
Fig. 3 is electrical connection schematic diagram of the present invention.
Fig. 4 is the cut-away view of Capacitor banks in the present invention.
Embodiment
As shown in Figure 1, Figure 3, compensation arrangement of the present invention is arranged in the overhead transmission line of 220KV, 500KV.The compensator with series capaci tance of the present embodiment is used for A, B, C three-phase alternating current, because electric current is at the circuit of more than 300A, major part high voltage transmission line forms a phase power transmission line (being called bundle conductor in industry) by multiple conducting wires, generally have quadripartion, six division or eight divisions, this example illustrates with quadripartion.Along power transmission sequence (from sending end to receiving end) every setpoint distance (as 1 ~ 5 kilometer or 10 ~ 50 kilometers), all connect in each phase power transmission line into a capacitor compensation unit, described capacitor compensation unit 1 ~ 3 wire got in this phase power transmission line retain original state as equipotential voltage clamp wire 1 (quadrifid get one be clamp wire 1, sexfidly get two for clamp wire 1, eight divisions get three for clamp wire 1), the remaining every root of wire is connected into Capacitor banks 2 after all cutting off.Finally the first and last end of each capacitor compensation unit is electrically connected by connecting wire 4.
As shown in Figure 2, described capacitor compensation cellular installation, between adjacent two suspension clamps 7, is separated by conductor spacer 5 between each wire, and insulation cover pad 3 isolated insulation is all used in the contact position of wire and suspension clamp 7 and conductor spacer 5.Because this example is quadrifid wire, therefore conductor spacer 5 is in hollow square, and four angles are connected with four wires respectively.Described insulation cover pad 3 adopts silastic material or fluorosioloxane rubber material, should possess weatherability.
For preventing broken by lightning, install the lightning arrester 6 of overvoltage protection at the two ends of each capacitor compensation unit in parallel additional, zinc oxide ZnO type selected by lightning arrester.Also can install spark gap protector additional simultaneously.
As shown in Figure 4, described Capacitor banks 2 is by high-voltage capacitor 2-1 by series and parallel, and installs insulating coating pipe 2-2 in the outside of capacitor additional and form, and the capability value of high-voltage capacitor and withstand voltage are matched by the line length of a capacitor compensation unit.Capacitor banks 2 is installed on wire by insulator 8.
After installing series capacitor compensation group 2, the transmission power of circuit is:
In formula: U1 and U2 is circuit first and last terminal voltage; X
lfor line reactance; Xc is the capacitive reactance of circuit; Pm is line threshold transmission power; δ is circuit first and last terminal voltage phase angle difference, i.e. merit angle.
Implementation method of the present invention will be introduced further below by example.
Embodiment one,
If seal in a capacitor compensation unit with every 2.5KM length, every phase power transmission line has conductors on quad bundled, and wherein a wire is clamp wire 1, and all the other 3 wires all seal in Capacitor banks 2.The reactance value X of known lead every kilometer
l≈ 0.38 Ω, equals reactance X with the capacitor value Xc in unit length in the design
lfor balance principle.
X
l ΣΩ=0.95 ,=2.5KM × 0.38 Ω, due to Xc=1/2 π fc, gets Xc=XL
Σ=0.95 Ω then capacitance
even use 31484UF capacitor, the counteracting balance of reactance XL and capacitive reactance Xc can be realized at the long solid conductor of 2.5KM.
Capacitor can be made to be uniformly distributed at circuit with this scheme.If calculate with every root current in wire 600A of conductors on quad bundled, the voltage that every root every kilometer upper conductor produces is 300V/1KM, ask for withstand voltage on capacitor, if single withstand voltage is 110V, 2.5KM (line length) × 300 × 2 (safety factor)=1500V (volt) magnitude of voltage, the ac voltage withstanding value of known single capacitor is 110V, for meeting 1500V, the quantity that need connect is 1500V/110V=13.6, get 14 capacitor series connection, select the film capacitor of NCC brand and model NIPPOn-450V/6800UF, 6800UF 14 capacitances formed afterwards of connecting are: 6800/14=485UF, 3184/485=6.5 only, if with 7 parallel connections, solid wire uses several 14 × 7=98 only, for preventing operating in L, near the resonance point of C, get 6 parallel connections, C=2910UF (microfarad).Only amount to capacitor 14 × 6=84, with every three calculating 3 × 3 × 84=756 mutually of three-phase only, installation cost 756 × 200 yuan=15.2 ten thousand yuan.Weight so that every 2.5KM is Unit 1: 0.9Kg × 756=700Kg weight.Cost is about 60,000 yuan every kilometer.In Practical Project is implemented, due to the capacitor pillar length 0.2M × 14=2.8M of 14 series connection, two-period form should be divided into install, namely with after 6 parallel connections, 7 series connection again, are a junior unit CD7, then are together in series with two CD7, and be formed on solid conductor and seal in 2914UF (microfarad), the level of actual string benefit degree 2914/3352=87%.
Embodiment two,
As with at interval of 30 kilometers, be a unit connection, the calculating reactance of this circuit is X
l=0.38 Ω × 30=11.4 Ω, still balances for offsetting with wire reactance XL and capacitive reactance capacitor Xc, i.e. X
l=Xc is calculating principle,
the rated voltage of this Capacitor banks is 300V × 2 × 30 kilometer=18000V (volt), rated current is 600A, in Practical Project, capacitor is arranged in line steel tower, arrange one by the molecular mounting platform of insulation, three wires of point A, B, C three-phase are connected access respectively, equipotential clamp wire 1 is connected the two ends (as shown in Figure 2) in every unit simultaneously, the voltage after such cross-over connection, Capacitor banks being born just reduces greatly, namely can not according to the proof voltage value of the electric pressure design capacitance device group of line voltage alternate on circuit.The installation and connection method of such use clamp wire, greatly can save and install the required investment of series compensation capacitor.
The economic analysis of specific embodiment: to carry 1,000,000 kilowatts of electrical energy to calculate, by conductors on quad bundled power transmission, the place beyond 100 kilometers, by wire reactance X
lthe reactive loss electricity produced calculates: the reactance produced by circuit is every kilometer of 0.38 Ω, then 100 kilometers is X
l=38 Ω,
Every phase current:
every root wire upper reaches overcurrent I
1=1154/4=288A
Reactive loss power: S=I
2x
l=288
2× 38 Ω=3151KVAR
Reactive loss charge value Q=ST=3151 × 5000 hour=1,575 ten thousand degree of (VAR) electricity, with capacity of idle power 0.3 yuan calculating, idle electricity charge W=1575 × 0.3=472 ten thousand yuan
If three-phase, 4 lines, within 1 year, loss of electricity is 3 × 4 × 47,2=5,670 ten thousand yuan, and loss value is very surprising.
The present invention in force, requires Capacitor banks withstand voltage 18KV, and condenser capacity is 280UF (microfarad), selects Capacitor banks model: the every separate unit of BFM12/2KV-500KVAR-1W outdoor type is withstand voltage is 6KV,
this single capacitor capacitive reactance is
single capacitor capability value is
power capacitor manufacturing firm is Xi-an Electric Power Capacitor Factory, or Guilin electric power capacitor factory.Single capacitor is first connected after 3, withstand voltage 6KV × 3=18KV can be met, capacitance after three capacitor series connection is 44/3=14.7UF, 280UF/14.7=19 only, 19 in parallel again, amount to series connection on 57/1 wire and form the Capacitor banks 2 of elementary cell, then at a Capacitor banks 2 two ends parallel connection overvoltage zinc oxide arrester 6.3 wire three-phases only amount to 3 × 3 × 57=513, cost: single capacitor price 600 yuan, 513 × 6000 yuan=3,078 ten thousand yuan, every kilometer of cost 307.8/30=10 ten thousand yuan/every kilometer.As safeguard protection during overvoltage of capacitor, lightning arrester first uses magnetic blow-out formula or piezo-resistance, and model is: FCD-20KV.
Equivalent in line reactance X with capacitive reactance capacitor Xc in this programme design
ldesign, but for avoiding resonance factor in Practical Project, get Xc=0.95X
land the value of setting.
The present invention is by series capacitor bank and establish the method for clamp wire, not only saved investment, and compensativity can up to 85% ~ 95%, close to the target of harmless transmission of electricity, the clamp wire of this equipotential mode can absorb the energy of reactive voltage simultaneously, the danger of over-voltage suppression.
Owing to considering being uniformly distributed of all fronts capacitor, distribution installed by shortening capatcitor as far as possible, if with 1 ~ 5 kilometer or 10 ~ 50 kilometers of intervals, make the secondary produced by current in wire induct caused by magnetic potential, the loss value of the parasite current in circuit is reduced, and adds power transmission efficiency.
Consider that the life-span of conventional capacitor was in 10 ~ 15 years, may in operation after 15 years, capacitor needs to change, but its funds saved are enough.Series capacitor compensation cost of the present invention is about 100,000 yuans/1 kilometer, and with 500 kilometers of calculating, cost 5,000 ten thousand yuan, the investment of mending about 500,000,000 yuan than the concentrated string of prior art is compared, the cost that the present invention saves greatly, and power transmission power can be larger.
Claims (6)
1. one kind is arranged on the compensator with series capaci tance on overhead transmission line, this device is installed on built on stilts AC high-voltage electric transmission line, A, B, each phase of C three-phase alternating current high voltage transmission line all has some wires, it is characterized in that: along power transmission sequence every setpoint distance, connect in each phase power transmission line into a capacitor compensation unit, this capacitor compensation unit 1 ~ 3 wire comprised in this phase power transmission line retains the clamp wire (1) of original state as equipotential voltage, and connect into Capacitor banks (2) in every root wire of remainder, the first and last end of each capacitor compensation unit is by connecting wire (4) electrical connection.
2. compensator with series capaci tance according to claim 1, it is characterized in that: described capacitor compensation cellular installation is between two suspension clamps (7) of reequiping through insulating of setting, separated by conductor spacer (5) between each wire, insulation cover pad (3) isolated insulation is all used in the contact position of wire and suspension clamp (7) and conductor spacer (5).
3. compensator with series capaci tance according to claim 2, is characterized in that: described setpoint distance is 1 ~ 5 kilometer or 10 ~ 50 kilometers.
4. compensator with series capaci tance according to claim 2, is characterized in that: described capacitor compensation unit have quadripartion wherein one be clamp wire (1), six divisions wherein two for clamp wire (1) or eight divisions wherein three for clamp wire (1).
5. compensator with series capaci tance according to claim 1 and 2, is characterized in that: the two ends of described capacitor compensation unit install the lightning arrester (6) of overvoltage protection in parallel additional.
6. compensator with series capaci tance according to claim 2, is characterized in that: described insulation cover pad (3) adopts silastic material or fluorosioloxane rubber material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510755054.3A CN105262111A (en) | 2015-11-09 | 2015-11-09 | Series capacitor compensation device on overhead transmission line |
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|---|---|---|---|
| CN201510755054.3A CN105262111A (en) | 2015-11-09 | 2015-11-09 | Series capacitor compensation device on overhead transmission line |
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Citations (8)
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|---|---|---|---|---|
| US5984173A (en) * | 1998-02-02 | 1999-11-16 | Siemens Power Transmission & Distribution, Llc | Neutral point connected apparatus providing compensation to an AC power line |
| CN1461509A (en) * | 2000-11-14 | 2003-12-10 | 魁北克水电公司 | Switching apparatus and method for varying phase line impedance of electric power transport line section |
| CN101699574A (en) * | 2009-11-06 | 2010-04-28 | 西安交通大学 | Insulator equalizing ring configuration structure of same-tower same-window double-loop compact transmission line |
| CN201466740U (en) * | 2009-06-10 | 2010-05-12 | 平顶山市康立电气有限责任公司 | High voltage automatic compensation device |
| CN203026886U (en) * | 2013-01-05 | 2013-06-26 | 内蒙古电力勘测设计院 | Four-cracking jumper wire support arm |
| CN104880620A (en) * | 2015-04-17 | 2015-09-02 | 国家电网公司 | Test platform of super-high voltage bundled sub-conductor ice-melting |
| CN104882881A (en) * | 2015-05-27 | 2015-09-02 | 中国能源建设集团浙江省电力设计院有限公司 | Extra-high voltage series compensation system |
| CN205141682U (en) * | 2015-11-09 | 2016-04-06 | 章则明 | Install compensator with series capaci tance on overhead transmission line |
-
2015
- 2015-11-09 CN CN201510755054.3A patent/CN105262111A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5984173A (en) * | 1998-02-02 | 1999-11-16 | Siemens Power Transmission & Distribution, Llc | Neutral point connected apparatus providing compensation to an AC power line |
| CN1461509A (en) * | 2000-11-14 | 2003-12-10 | 魁北克水电公司 | Switching apparatus and method for varying phase line impedance of electric power transport line section |
| CN201466740U (en) * | 2009-06-10 | 2010-05-12 | 平顶山市康立电气有限责任公司 | High voltage automatic compensation device |
| CN101699574A (en) * | 2009-11-06 | 2010-04-28 | 西安交通大学 | Insulator equalizing ring configuration structure of same-tower same-window double-loop compact transmission line |
| CN203026886U (en) * | 2013-01-05 | 2013-06-26 | 内蒙古电力勘测设计院 | Four-cracking jumper wire support arm |
| CN104880620A (en) * | 2015-04-17 | 2015-09-02 | 国家电网公司 | Test platform of super-high voltage bundled sub-conductor ice-melting |
| CN104882881A (en) * | 2015-05-27 | 2015-09-02 | 中国能源建设集团浙江省电力设计院有限公司 | Extra-high voltage series compensation system |
| CN205141682U (en) * | 2015-11-09 | 2016-04-06 | 章则明 | Install compensator with series capaci tance on overhead transmission line |
Non-Patent Citations (1)
| Title |
|---|
| 方复明 等: "电网中的串联电容补偿", 《电网技术》 * |
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